| 摘要 |
An overcurrent sensing circuit for use with a voltage regulator, such as a linear post regulator for a power supply, utilizes a field effect transistor (FET) both as the pass element for the voltage regulator, and as a current sense resistor. The output voltage from the FET is fed back to an input of a differential amplifier, which generates a control voltage for the gate of the FET, so that the output voltage will remain constant. If an overcurrent condition occurs through the FET, the control voltage will exceed a set point, thus driving the FET into saturation, and sensing circuitry will generate an overcurrent output that can be utilized to shut off the regulator. A single sensing circuit can be used for multiple regulators if desired.
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